I've had my Rio60 locking up with v1.03 too. This has happened both in the car and in house. The player just stops and is not responsive to me pushing buttons. I don't know what's causing it, and it can only be cured by powering down the player and re-booting it.
Yesterday I've flashed the player with a beta (2.11) for the first time (I wanted to have most of the bugs ironed out before I used one) and so far I haven't had any problems other than a synch error. (which only happened one time)

So far I'm absoutely loving all the new features, infoscreens and visualisations! If the players starts acting up though, I'll make mention of it on this board.